What is the different Between Class and Id in CSS?

Question

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Answer 1

Class can be used multiple times but id is supposed to be used only once

Answer 2

One element can be specified by many class but 1 element can't get many ids

Answer 3

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but here's your salad-:

Id is unique, so every element has different id.

Many elements can have same class name since classes aren't unique, and that helps manipulating collectively just using a single class name, than styling each one of them with different id.

Answer 4

With ID we can have only one element with that ID
on the other hand there can be as my elements with same classes in a html document